CLOUDED YELLOW BUTTERFLY. 
105 
that plant is not indigenous to Britain, it probably 
feeds in this country on some diadelpbous herb per- 
taining to the same natural order. The butterfly 
occurs in the south of England in considerable plenty 
in particular years, while in others scarcely an ex- 
ample is to be met with. It seems to prefer the vi- 
cinity of the sea, having been found more copiously 
than elsewhere along the south-east coast, particu- 
larly in the neighbourhood of Dover. It is likewise 
seen occasionally in the midland counties. Over 
foreign lands C. edusa is characterised by a very ex- 
tensive range. It is well known in most portions 
of the continent of Europe. Mr Burchell found it 
in the south of Africa, and Mr Swainson has seen 
specimens from the mountains of Nepaul. 
